Molding-machine.



(I. ALLENSON.

MOLDING MACHINE.

APPLICATION FILED MAR. 31, 1911.

1,070,223. 7 Patented Aug. 12, 1913.

3 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH 60.. WASHINGTON, n. c.

UNITED TATE PATENT @FFIQE.

JOHN ALLENSON, OF ST. PAUL, MINNESOTA, ASSIGNOR TO ST. PAUL FOUNDRY COM- IPANY, OF ST. PAUL, MINNESOTA, A CORPORATION OF MINNESOTA.

MOLDING-MACHINE.

Specification of Letters Patent.

Application filed March 31, 1911. Serial No. 618,117.

To all whom it may concern:

Be it known that I, JOHN ALLENsoN, a citizen of the United States, residing at St. Paul, in the county of Ramsey and. State of Minnesota, have invented a new and useful Improvement in Molding-Machines, of which the following is a specification.

My invention relates to improvements in molding machines and more particularly to that class used for molding metal in flasks, and having a press and a compression head, between which parts a flask and pattern frame may be interposed.

The primary object of my invention is to produce a mold in the flask in a more efficientand effective manner than heretofore and particularly to produce lateral rigidity and a smooth vertical movement between the coacting parts, together with simple structure.

This application is an improvement upon the construction set forth in my Patent Number 955,838, granted on the 19th day of April, 1910. reference thereto being made for more complete detail regarding the mold elements and their operation, and differs therefrom in the construction relation and action of its parts. I

My device consists primarily of a telescoping cylinder structure concentric with the aXis of the press and compression head.

In the drawings with which I have illustrated my device and which form part of the specification, Figure 1 is the front elevation of a molding machine showing all of the parts in position to begin the operation of making a mold; Fig. 2 is a side elevation of Fig. 1 showing how the pattern frame with a pattern may be removed from between the cope and drag preparatory to clamping them together and withdrawing them from the mold; Fig. 3 is a section on the line AA, Fig. 1 showing the structure of the concentric cylinders; Fig. 1 is a section on the line BB, Fig. 3, showing a section of the press, and Fig. 5 is a partial section on the line CC, Fig. 3 showing the air inlet.

My device as illustrated consists of a frame work composed of two vertical shafts 2 and 3 which are spaced apart and secured at their lower ends in a horizontal base a by means of set bolts 5. The upper ends of these shafts are supported by means of a space bar 6 through which bolts 7 pass into the ends of the shafts. The upper ends of the shafts are threaded to support adjusting nuts 8.

Extending horizontally between the upper ends of the two vertical shafts 2 and 3, is an abutment head 9 of triangular cross section, mounted upon a horizontal axis 10 j ournaled at one end in the sleeve bearing 11, which is revoluble upon the shaft 3. This sleeve is supported upon the shaft by a collar 12, below, fixed thereto by set screws 13, and above, by the adjusting nuts 8, allowing the abutment head to swing in a horizontal plane. This motion of the abutment head is limited by the stop 14 upon the sleeve 15 on the shaft 2 which engages the end 16 of the axis of the abutment head. Upon the shafts 2 and 3 are mounted collars 17 adjustable by set screws 18 and carrying the hinged arms 19 which are adapted to support the cope 20. Below the collars 17 are collars 21 clamped upon the shafts and carrying the track bars 22 on which operate the antifriction wheels 23 of the pattern frame 24,

Integral with the base and between the lower ends of the shafts is the main cylinder 25 of the press having within it a piston chamber 27 in which operates the annular piston 26. The piston 26 has formed within it, a piston chamber concentric with the main cylinder and adapted to contain and receive oil as hereinafter described. Within this piston chamber lies the piston 28 which is integral with the base 4 and has an axial passageway 29 connecting with the piston chamber 29 and through the passage 30 in the base with the pipe system 31. The main cylinder 25 is closed by a cylinder head 32 through which moves freely the body 33 of the piston 26. The upper end of the piston 26 is covered by a plate 34 which forms the head of the concentric piston chamber within. This plate together with a circular plate 35 carried by a shoulder 36 on the upper end of the piston body forms the compressing head of the press, on which rest the pallet 50 and the drag 51. Depending from the plate and forming a protection against dust for the working part, is the cylindrical hood 37.-

Patented Aug. 12,1913. 7

A guide rod 38 is fixed to the under side of the plate 35 and extends through the cylinder head preventing the rotation of the piston; an opening 35) in the cylinder head mmmnuieates with. the chamber 27 above the piston E26 and acts as an exhaust port during the raising of the compressing head by the piston 26.

At the lower end of the vertical shaft 3 is secured a liquid reservoir it), the bottom of which is connect-ed through the pipe system 31 to the piston 28 and passage 'ay 29. The pipe ll connects the pipe system 31 with the top of the reservoir at) and contains the regulating valve 42, operated by the handle A. check valve 44 is interposed in the pipe system 31 between the reservoir and its i-l'it'iimi with the pipe ll, preventing the return of liquid into the reservoir through the pipe 31. also an intake pipe is formed with a curved end fitted to draw liquid from a pail int-o the reservoir.

The main cylinder is supplied with compressed air from any suitable source through the intake pipe 4-6. A pressure gage l7 and a two way valve 48 are connectcd with this intake pipe, governing the flow of air into the cylinder through the passage 49 in the base it when in one position, shutting off the flow of air when in the reverse position. and opening the cylinder 25 to the outside atmosphere through the pipe 48 to allow the air in the same to exhaust.

In operation, the parts are assembled in relative position as illustrated in Fig. 1, the valve 18 is opened to admit air into the main piston chamber 2 7 in the cylinder 25 and the piston head 26 is forced up carrying with it the cmnpressing head, and the pallet and drag resting thereon. As the press rises, liquid from the reservoir 4:0 is drawn through the pipe 31 into the passageway 29 forming a stop or cushion for the press in case the air pressur gives out. \Vhen it is desired to lower the compressing head in the process of fashioning the mold, the valve +18 is reversed into the exhausting position and the air from the cylinder will pass out. of the pipe it? and the weight of the press will rest upon the liquid in the passageway 29 and its connecteifl chamber. This liquid acts as a cushion preventing the sudden descent of the compressing head, making impossible any jarring of the flask and mold through the accidental cutting off of the air supply. The compressing head can descend only by the operation of the regulating valve 19 which when open, allows the exhaust of the nit from the passageway 29 back into the -rcir to, through the pipes 31 and 41. Dining the operation of the con'ipressing; head, the guide rod 338 prevents any rota- 11011 of the hca d and the resulting mismatchin of the flask parts, and the concentric p0 In the top of the reservoir is,

sition of the telescoping piston renders the umvement of the head uniform and laterally rigid.

In accordance with the patent statutes I l a ve ltBSt ibcd the principles of operation of my invention together with the apl iaratus which I now consider to represent the best embodiment thereof but I desire to have it understood that the construction shown is only illustrative and that the invention can be carried out by other means and applied to uses other than those above set forth within the scope of the following claims.

Having described my invention, what I claim as new and desire to protect. by Letters Patent is 1. In a molding machine, a supporting frame, a reciprocable compressing head mounted thereon, a cylinder on said frame having a hollow piston fixed concentric.

therewith, an annular piston working in said cylinder to raise said head and having a recessed chamber fitting said fixed piston and forming therewith an auxiliary chamber adapted to cushionally regulate the re traction of said head and means for reciprocating said head.

2. In a molding machine, a supporting frame, a reciprocaliile couiiprcssing head, a hollow piston supporting said reciprocable compressing head, a cylinder mounted on said frame in which said hollow piston reciprocates, a chamber axially formed in said cylinder and extending into said hollow piston having a piston formed on its outer end which operates in said hollow piston when the same reciprocates to form suction chamber, fluid means valveably connected with said suction chamber to cushionally regulate the retraction of said connar-cssing head, and separate means for elevating said hollow piston in said cylinder, substantially as described.

3. In a molding machine, a supporting frame, an abutment head thereon, a reciproeable compressing head acting in opposition to said abutmenthead, an annular piston supporting said. rcciprocable compress ing head, a cylinder mounted on said f nine in which said annular piston is adapted to operate, a fixed hollow piston integral with said cylinder, being concentric with said annular piston and operating therein when said annular piston reciprocates to form a suction chamber, a valved liquid passage opening into said suction chamber through said fixed piston; whereby the retraction of said annular piston during its reciprocation may be cushionally controlled and separate in M1118 for elevating said annular piston in said cylinder substantially as described.

4. In a molding machine of the class set forth, comprising in combination, a sup-- porting frame, an abutment head thereon,

a conmrcssmg head rcciprocating in oppm sition thereto, a cylinder and separate piston name to this specification, in the presence of for operating said compressing head, a liqtwo subscribing Witnesses.

nid cushion axially located in said cylinder for controlling the retraction of said coni- JOHN ALLENSON' pressing head and means for extending said WVitnesses: p1ston, substantially as descrlbed. H. L. FISCHER,

In testimony whereof, I have signed my PAUL S. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. G. 

